I feel the best all around match for the B&M blue is the Accupaint B&M blue made by SMP industries. It is available at most hobby shops in the New England area although it is getting somewhat harder to find. I would get some and spray it onto a sheet of styrene. You can then take that to you local paint store and have them match it in whatever paint you want to use. That seems to be a better choice than the number of 1 oz. bottles of Accupaint you whould need in 12" to the foot scale -

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Dick